I don't want to ruin your hopes hehe, but from what they talked about double summoners and the new abilities it is very likely that Revellion will be a fairly strong expansion, of course when it comes out untamed some Chaos cards will be revalued, but I think the only thing that saves us from a real loss is a general bull market.
And believe me, some of us would have preferred to buy Chaos because at least they have utility and unlike me, I bought it in TD and we still don't even know the release date of the game :(