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.
05 Hummer H2 SUV on OEM Air Ride
Forged 11.4:1 408 LQ4 (K1 crank & rods; Mahle pistons)/CPP LS3 CNC heads/BTR Stage IV LS3 cam/home ported L92 intake manifold/ported 90mm TB/custom Volant CAI/mid-length headers/AFE dual 3" CB/Corvette Servo/el cheapo lift/Cognito UCAs/Sphon poly adjustable TA/Sphon adjustable rear LCAs/e'fan conversion/DirtyMax radiator/Moroso catchcan/HPTuners/HID conversion/LED exterior lighting/LED interior accents/Autometer Cobalts/AEM WBPioneer AVH-5600BHS/Pioneer GM-9601/2-Pioneer TS-W310D4s/Obcon Labyrinth dual-12 box/lots of other little stuff