I believe I remember reading LS2 and LS7 are as good as gone, just like what has already been mentioned.
I could see an LS8 but can't, in my mind, rationalize why they would have another supercharged 6.2. It seems to me that LS9 and LSA are perfect candidates for top-performing models, so why not use at least the LSA, for more platforms? It's already a seemingly known commodity for GM and has spanked at the 'Ring, so why not bump up the Z06's power from 505 to 550 and similar for a Z28, or what have you? It just doesn't seem likely that GM will stuff a heavier engine in the Z06 with less power, hence my humble opinion on the LSA.
"...What IS true: We anticipated that this would happen - we are never finished - and yes, Ford DOES deserve to win now and then. To think that GM can come out with a car to make ford throw in the towel is simply foolhardy..." - fbodfather