It could be many things; Tearaway or a new IP but LBP4 just seems an obvious choice given the franchises success:

MM should try make new Sly Cooper or Jak and Daxter. They are very talented and creative.

I heard MM staff was involved in the development of other titles from the UK studios, maybe that's what they mean here as they surely are compensated for that (the studio very clearly handles it finances itself).

If they do just call it little big planet. Drop the 4. A ps4/ps5 release would make sense.

But yeah I like the idea of them making a new jak or sly Cooper. Why not? 

Shit, a thought just struck me. What if one of these new IPs is made with Dreams?

I think LBP had a good run. I hope it's something new.

yeah they have been invested in Dreams for awhile, i was thinking that too.

It's certainly a capable engine and toolset and Healey has said on more than one occasion they're thinking of allowing people to export their creations as a standalone game. That could be how they plan on making money from Dreams. Allow people to sell their games on PSN (quality controlled of course) and take royalties. 

After LBP3, i sincerely hope they arent. But if they are, then unless something drastically changes in formula, im staying far far away.

They didn't make LBP3 though.