In the Exchange 2010 exist There is very useful function: Database Availability Group

What is this ?
ExchSrv1(with databases: D1 and D2 + D3s+D4s)
ExchSRv2(with databases: D3 and D4+D1s+D2s)

DAS automate synchronize databases
- D1 and D2(fromSrv1) to the D1s and D2s(in the Srv2)
- D3 and D4(from Srv2) to the D3s and D4s(in the Srv1)

Any body know - similar function in GW is planed or it and so is, but I do not know about it?