I like all these ideas, but personally I'm most excited about the PvP Lottery with a short-ish timeframe (like 1-3 hours), or multiple lotteries with different timeframes to suit everyone, and Keno.

Keno is super addicting, for me at least.
I've looked at some sites and I saw keno rounds that are per-player. The game reveals the numbers and done. What about a more social game, with "shared rounds", like every 30 seconds? So that numbers are being drawn for all the players and you can see other players placing bets? Plus some progressive jackpot? Could it be more fun?