I've corresponded with Nicole via email primarily - she's the wedding coordinator at Las Caletas, and is AMAZING! She's actually a member of this forum, but isn't on here very much. I've talked to her once on the phone, right when I was booking my date.
I obviously can't tell you what dates area available, but let me know if you have any other Las Caletas questions. Three brides from this forum got married there in Jan., and one on Valentines Day - so there are lots of pictures to look at, and more coming! Here are some threads if you want even MORE info!
http://bestdestinationwedding.com/forum/t2597
http://bestdestinationwedding.com/forum/t1775
http://bestdestinationwedding.com/forum/t2216
http://bestdestinationwedding.com/forum/t1304
As for having enough time ... honestly, I still think you could do it in June if you wanted to! You'd obviously have to be flexible with dates, be able to find a dress that you can get in time, stuff like that - but it's possible! Your guests also wouldn't have a ton of notice - but if they're the type to be able to pick up and go somewhere in June (kids are getting out of school!) - then you can probably swing it!