Unfortunately the E195 will be a comparitvely small fleet size when compared to the Q400 (something of the order of 15 - 20 ships vs 60 -70 when all orders are received), that coupled with the fact that many current flight crew members want to jump across to the new machine mean that you'll be at the end of a fairly long line of guys and girls more senior than yourself. You can increase your chances by agreeing to go to any base at the company's descretion, but as things stand I've heard of a couple of cases where people have hopped across after 18 months or so on the Q400, although I suspect that this is set to get longer as time passes.