Edit: To elaborate, I'm referring to the tablet thing. That doesn't feel like a very "Sony" move. I'd expect that more from Nintendo or Microsoft. Playstation's move for next gen will mostly just be a better, stronger console. The company has plenty to leverage in the mobile space already anyway with their Aniplex properties. Fate GO alone makes like a billion dollars per year.
Sony has a long history of dabbling in 'unconventional' side projects and business experiments, so I'm not sure where that perception's coming from.
I'm not sure about this tablet rumour or what it would mean specifically, but it wouldn't be so surprising.
Well, I think the only thing that could surprise me there would be a completely self-contained machine.
But when streaming becomes a bigger 'thing' - and maybe next-gen is the time - then a cheap and optimised thin client tablet for streaming would be inevitable for Playstation given their history with remote play and their interest in streaming. Collaboration with the tablet division on some tech to embed in Sony tablets to reduce latency or whatnot on generic Sony tablets? Maybe. A controller dock for generics? Maybe. The one variation that seems unlikely would be some separate local-play tablet machine ala Switch, for example.
All that said, this particular rumour is vague. But if they're going to make a push on streaming next-gen, then a suite of cheap thin PS clients in various configurations and/or collaboration with their other divisions on optimisations in existing device types for those services, would make total sense.
(I don't think this means streaming services would be exclusive to such devices btw. Far from it. But I could see them marketing branded thin clients for the segments of the market that want to use something more game-y or that don't necessarily have access to their own generic device e.g. kids)