A list of what tanks popped up for research wouldn't mean much though. It's completely random and doesn't take into account if the tank popped up previously or not. Alyona and Johanna (sturmtiger) have shown up 3 times so far for research while Violet (AMX13) has only shown up once. Seren meanwhile has never shown up our research yet.
It's all random (and everyone gets the same list of researchable tanks each week of course)