In a Bluetooth SIG listing (a trade certification group), LG has officially confirmed the existence of the E970 and LS970. The former is possibly headed for AT&T (it has AT&T GSM and LTE bands - which could mean Rogers as well) and is packing a quad-core Qualcomm S4 Krait chip, complete with the latest Adreno 320 GPU goes toe-for-toe with the Galaxy SIII in GLBencmark. The 1280x768 resolution is something of an oddity - why the extra 48 pixels? A 13MP rear camera and 2GB of RAM round of this beefy device's specs. It's actually quite similar to the upcoming Optimus LTE2, so we could be seeing a carrier-specific iteration of that hardware here.
The latter's "LS" prefix denotes a Sprint device we covered previously, and basically seems to be the same as the E970 minus GSM (it's a CDMA / LTE device) and virtual buttons, as its resolution is listed as 1280x720. One name that has been throw around for the LS970 is Eclipse 4G LTE - so we'll see if that comes to pass.
LG has indicated in the SIG listing that these devices are slated for release in North America "around 10/31/2012," so expect them to be hitting store shelves this fall.