amok: Several assumptions here. Most importantly you assume the film will be set after Gollum escapes from Mordor and is captured by Gandalf and Aragorn. Why cannot the film be set in the time between Bilbo getting the ring and Gollum is captured by Sauron? There is what? A 30-40 years period here that has Gollum searching for the ring - why not set the film then? Tolkien has noting to say abpout Gollum in this period, so the writers can more or less do as they want.
Well yeah, I'm operating under the assumption that the "Hunt for Gollum" will be about what is usually referred to as "the Hunt for Gollum" and not some other stuff that happened to Gollum. Also, it seems a pretty reasonable assumption they'd want to bring in familiar characters, regardless of how good an idea it is, like they did with Legolas in The Hobbit films.
amok: Also - noone say you have to use the same actors. It not exacly shockingly new to use different actors in very long film series.
Amazing. Do you think that might be why I'm talking about recasting in my post? All I'm saying is that recasting such iconic roles is always risky, and it's likely to be jarring when it's supposed to tie in with existing movies and is most likely set just before/during the first one. It's just likely to underscore the "you're watching a belated cash grab" rather than something that organically fits in with the trilogy.
Unrelated, but I just happened upon this hilarious quote in
The Hollywood Reporter
one suspects that the popularity of the video game The Lord of the Rings: Gollum, which was released last year, was at least part of the project’s inspiration.
Yep, that was one tremendously successful game :D