I was shooting for April or May and got it in under the wire in March. Well, that's not entirely true, I still have to take another pass before my alpha reader (Robin) can put eyes on it, but her birthday is April 8th and I'm shooting for that. But I've "wrapped" the series and now know how it all ends. I'm really happy with how it's come out, and I hope others will be as well.
Writing an entire series before publishing any books is a lot of work, but I really think it paid off. I have a few changes to make to the first book one that came up in the last few pages! Now we just have to get the first book released - but it's Del Rey that has the remaining lifting for that book. Still, can't help but be excited about being done.