In this from linkedin via Semiaccurate Seronx:
1) It's not speculation that upgraded consoles from both Microsoft and Sony are coming in 2017. This is supported by
Letters to the Eu power boards stating a Third tier supporting 70 watts for Navigation is coming in 2017. (page 10)
2) The following Linkedin post seems to indicate Backward compatibility for both revisions. That's highly speculative at this point.
Which begs the question as to what three modes mean? Are both the PS4.5 and XB1 II to have backward compatibility with a continuation of XBOX 360 BC for the XB1 and new for the PS4.5, PS3 BC?
The three modes could be PS3, PS4 and PS4 NEO. For sure the NEW XB1 should continue to support XBOX 360 so it has three modes that need to be tested.
In the thread I quoted Seronix, he corrected himself and states that both the XB1 II and PS4 Neo would be using a
eExcavator processor which I'd guess means an embedded version, cut down version for APUs. Supporting this is that AMD would be using this in other APUs coming in the near future and have already created FinFET designs using this CPU. CAT cores would not be carried through to 14nm FinFET (speculation). If it helps think of eExcavator as a Jaguar core updated with Excavator features that AMD has decided to call Excavator for advertising reasons. For the same reason Sony is using AMD GPU FinFET blocks rather than shrinking the PS4 APU and having to redesign with FinFET can also apply to the CPU but would change to what AMD is carrying forward for their CPUs which the following slide supports Excavator.
Eurogamer has stated that the PS4 NEO is getting a CAT core but we know that at least the version in the current PS4 can't support BC. If we are to guess that the Linked in cite does mean PS3 BC is coming then whatever CPU core is being used has a higher IPC (more powerful) than Jaguar.