Gnar Thoughts
First of all, if you haven't met Gnar yet, here's the link: http://na.leagueoflegends.com/en/champion-reveal/gnar-the-missing-link
So what i think is that it was an awesome idea to make a forced transformation, to help reduce the OPness double-form champions usually have. That will offer Gnar's opponents tons of possible ways to counterplay. Also, Gnar looks incredibly cute. Didn't see that coming :O
The main issue, in my opinion, will be how fast his rage bar goes up. If it's too fast, Gnar players could have problems in some situations, like what if when you're chasing someone as mini Gnar you must become the slow, not really mobile Mega gnar? I'm a bit worried about that but i think Riot knows what to do and will give us a really good champion I think it will reach the Renekton level in the top lane, he's tanky, ranged, cc, mobility, and his ult :O
EDIT: i can't help being really disappointed after his voice lines and lore came out. It was a good opportunity to expand league of legends lore with the interaction between Yordles and the Watchers, but no. Gnar says absolutely nothing and so does his lore. Why does riot ignores the lore so hard? I guess he won't even have any interaction with other champs since he can't speak. How sad.
Just a question to @riot: since he looks like a "jungler" , and you talked about a new yordle jungler last year that was then cancelled, is it possible that Gnar contains some of the old yordle jungler? I mean both his mechanics or looking.