Ok, if your husband likes microbrews on tap, I am going to write this as if it is to a beer geek / snob, so I hope nobody gets offended.
There is a lot of beer in world showcase at Epcot, but most is fairly mediocre, imho, the sort of imports that you would see most anywhere. Like in Germany they have Beck's, which is a shame if you think of all the German beer out there. In Norway they have Ringnes, which is an OK lager, but they don't have any of the superior Aass from Norway. That sort of thing. The best bet in Epcot, without a doubt, is Rose and Crown, guiness, bass, harp, tenents, and bodington's on tap.
The microbrew choices are fairly limited. Big River is OK, but it isn't the best big river location, and all big rivers are sort of mainstream touristy anyway, imho. The beers there tend to be fairly lowest common denominator. Expect a pilsner, a basic lager, a light. They usually have a fairly hoppy amber that may be your best bet. In the spring they may have a wheat which is pretty good, and some darker beers in the winter. If you've been to a big river or rock bottom you know what to expect, but this one doesn't have as much variety as the other locations.
One of the wider beer selections at walt disney world is at the crew's cup at the yacht club. They have several choices, but it is all bottled, the stuff on tap is pretty basic, sorry. You can, though, make a pretty nice loop out of rose and crown, crew's cup, and big river. Another nice stop is Matsu Noma lounge at Japan in Epcot, they have the Kirin products which are good imho (I like Kirin Ichiban). All bottled.
Beyond that, in world showcase, let's see. Canada has moosehead and some of the lower level canadian beers (I can't remember if molson or labatts or both). Morroco has casablanca, which is a pretty drinkable lager with a sort of faint white taste. France has LaBelle's, very drinkable, light, faintly sweet. Germany has the Beck's. Italy has Peroni, if you haven't had that it is an easy to drink straight forward beer. The outpost is always a mystery - sometimes they just have the casablanca, sometimes they might have something else. Once recently they had red hook, go figure. Once they had Kingfisher from India. China has the basic Chinese beers, and Mexico has the basic mexican beers (XX, not negro modelo or anything like that). It can be a lot of fun sampling your way around, though, so make the best of it. Let me see, all botteled except rose and crown, and the bakery in Norway for ringnes - don't quote me on that, but I think this is true. Germany may have beck's on tap. Tell your husband that, sadly, there is no Belgium pavillion.
Beyond that it is pretty basic. One microbrew on tap that I can think of is Red Hook (usually ESB, but I think there is some seasonal aspect to it) at the Territory Lounge at Wilderness lodge. The territory lounge is one of the better resort bars, imho. You are staying at the AKL, which I'm happy to tell you has a better than average selection at victoria fall's, their main lobby bar looking over Boma. They have a pretty good selection of imports, but than most of the resort bars by far. A lot of the resort bars only have american macrobrews, plus maybe corona and hienekens, you can occasionally find one or two others, (dixie landings has guiness stout, trout pass has guiness drought, etc.) but those are the usual suspects at most disney bars. Victoria falls is pretty good. The pool bar at animal kingdom lodge has the basic americans and safari amber, which is a special label from anheiser busch that isn't that bad. Sometimes the little stores in the resorts have a beer or two in the cooler beyond buds and coronas, usually for a good price (ex. bass) so it is worth to check it out. Also, Goodings (which is too high for regular grocery shopping) at the crossroads by downtown disney has a pretty decent beer selection if you want to stock the room.
You have to remember that it is a touristy place and they are in it to supply the most people as possible, so there isn't a lot of craft to it - wdw does a better job with frozen rum drinks than beer, imho, but there is enough variety to keep most anyone happy if you look around. Pleasure Island is pretty disapointing for beer, but there are some good drinks (this is especially true of adventurers club. Why hey can't have a single decent beer there is beyond me). But, like I said, there is enough around to make most anyone happy -
DR