Continue where Claymore anime stooped.
Do completely new Claymore OVA.
Well they gather over 12.000 signatures for season 2.
But what's the point of making it when you don't know how the story will be over, yet.
I to am glad that manga will continue for some time, but the way I see it the only way they are going to made Claymore season 2 is by Yagi giving them spoilers for the end. And I very much doubt that he will do that.
Not to mention that we will know how the manga will end and that would be a little stupid.
Hasn´t the first "season" an anime-only story-end ??