The MSRPs on the lenses are as follows:
Canon EF 8-15mm f/4L Fisheye USM lens - $1,400
Canon EF 70-300mm f/4-5.6L IS USM lens - $1,500
Canon EF 300mm f/2.8L IS II USM lens - $7,000
Canon EF 400mm f/2.8L IS II USM lens - $11,000
Canon Extender EF 1.4x III & Canon Extender EF 2x III - Approx $500 each
I didn't see new prices for the 500mm or the 600mm. I'm not sure how those MSRPs will translate into street prices.
It looks like they have dropped the non-L 70-300mm f4-5.6. That is still a crowded range for them with the 70-300mm 4.5-5.6 DO, four variations of 70-200 (f/4 or f/2.8, with IS or without), the old 75-300mm (with or without USM), the 100-300mm f/4.5-5.6, and the 100-400mm f/4.5-5.6.
I bought the 300mm f/2.8 earlier this year. I love the lens as it is. I'm curious to see how the new lens compares. However it shakes out, I can't imagine a scenario in which I upgrade.
As cool as the bigger lenses are, I was already priced out of that market. New, improved, and more expensive versions are just going to exascerbate that problem for me.
The 70-300mm looks interesting. I was considering getting the old version as a relatively small/light lens to throw in when I don't want to carry the 70-200 f/2.8 or the 300 f/2.8 but might want the reach. The problem is that the new one isn't all that small or light.
The 8-15mm fisheye looks like a lot of fun. I was never interested in fisheye until I saw some of Groucho's shots here. I bought the 15mm earlier this year and have used it more than I expected. I still haven't used it all that much, but it has been fun. I might get this one someday if I'm feeling flush with cash.
I've already got the prior version of the 1.4x and 2x extenders. I don't see my self upgrading either of those unless they've made remarkable changes.
I'm not really interested in the 60D. I'm waiting for either the 5D Mark III, the much rumored large sensor video camera, or possibly the 1D Mark IV. The last would require some combination of large price drop (haven't seen that happening lately) and something amazingly appealing (like a huge increase in resolution, dynamic range, or something).