https://www.resetera.com/threads/ps...ion-post-e3-2018.49214/page-185#post-13761677
Benji did not confirm "BC issues", he said the opposite - he has heard the same that there is a delay (except for BC stuff)
My opinion is that delaying PS5 for PS4 BC is an absolutely ludicrous proposition for many reasons. It's totally unbelievable, and rumors with that as the keystone should be dismissed out of hand by anyone with any sense. PS4 BC on a newer x86/GCN architecture is not some supremely difficult task that will take many many years for an engineering department of mammoth size and funding to get working at all, FFS.
The Xbox One is lauded as having "amazing" BC by "wizards", yet it's something like ~20% compatibility with last gen, half a percent with the generation prior? (mostly licensing issues, you'd think). Sony could start
right now working on PS4 BC for PS5 and achieve better coverage than that by a 2019 launch. No ahead of time recompilation (therefore distribution licensing) needed, architecture will not change drastically. Hell, they could just download RPCS3 and that'd give them 30% PS3 BC coverage too for almost no effort! We know they have near perfect PS1, PS2, PSP and Vita emulators already.
Even if there were PS4 BC issues that meant it wouldn't work AT ALL for an additional year, I don't believe that's enough for Sony to delay launch, when they could simply say with confidence "BC coming soon", and not cause disaster among all the other parts of the next gen launch machine that are ready on time.