DB suit doesn't affect WMIH Corp m/a at all. WMIH Corp isn't a party. WMILT isn't even a party. WMILT and WMIH Corp is not listed as either plaintiff or defendant.
DB themselves isn't in trouble. In their suit, they win either way, either FDIC is responsible for their claims or JPMC is. First judgement has resulted in FDIC responsibility.
Whether that changes at all at appeal is left to be seen.
It shouldn't. The estate would just need to set aside enough money in the event that Deutsche Bank succeeds in their case against the FDIC. If they don't, the money would go back to the estate.