Actually, lowers will be pushed back to late 2009.
They will all be complete lower receiver groups. Not sure on details. Probably two options I can think of right away. With BCM Milspec M4 stock, or with just Milspec receiver extention (so you can equip it with the stock of your choice)
Sorry, I wish news was better, but there is so much new stuff going on - only so much can be done well at once.
Thanks for your interest,