it's selling out much faster these days, and wine & dine is expected to sell out sooner than usual with this year being their 5th anniversary.
there's talk that the current rate for DL Dumbo is 50% and DL Half at 30%. If you have an AP, They're opening registration at 8am PST on the 28th for all the races. Public registration is at 9am PST, though to be honest, it doesn't even matter anymore, if you see the link, register when you see it.. don't delay.
as for the Coast to Coast, as others have mentioned, yes it needs to be within the same calendar year. you can't carry over. I thought of it too and called to ask so I got a direct answer. There are quite a few opportunities this year that have already passed and/or are coming up, but if you haven't registered yet, then DL Half & Wine & Dine are your best bets. I did that last year and got my C2C at W&D.

If you want (and you can) you should bring your DL Half medal(s) with you to florida to take a pic. Below, i brought my tink half & dumbo medals with me last year.. come with 4 medals, leave with 6.