What I want to know is what role Lego and Blackstone are each taking on. I've heard from other members here with experience from other Merlin parks that they're not that great and the Legoland parks are only good because the Lego company holds them to certain standards. So with Lego taking on more ownership of the parks this seems like it could be a good thing, especially if Blackstone is entering as a money/investment partner and letting Lego control things. It would also be interesting to know what percentage each company is going to own.
Edit: I should have read the article in the link first, apparently it's an even 50/50 split. So that seems really good. Blackstone has no more control over it than Lego and likely Lego still holds the licensing agreements which probably tips the scale in their favor for any decisions.