Lego Prince of Persia has already come out, although they have not yet released a huge amount of sets like with Star Wars or Harry Potter.
The will be Prince of Persia LEGO sets based on The Sands of Time film, as well as action figures and the Dagger of Time by McFarlane Toys.
Not yet, but that would be a wicked cool Lego theme and I strongly suggest you write letters to the company about it. I know I'm going to. In the meantime, some of the "Prince of Persia" sets have some Romanesque features.
In summer of 2012
They only made lego sets for the first three movies.
Nobody knows where Lego will export their sets next, try contacting the Lego Support team, and see if they'll come up with an answer.
Lego dino is one that will come out. and Friends are a product for sale in jaunary
in march
the Lego sets of 2010 sre: Prince of persa Toy story Cars
I doubt it, because halo is to violent of a game for Lego to come out with. But I've seen a few on eBay, which are fan made. But no, it will be unlikely for Lego to push forward a Lego Halo.
They should be already out in Lego Stores and on their website already.
There are no minecraft pistons made for lego sets yet.