They're coming, but a lot of it is TBD until the FA Cup QF happens on 29 Mar in between GW29 and GW30.
The odds are 96% on City and Villa having a DGW, given if either wins, it's happening. Villa especially will be strong favourites to advance, but it will only take 1 given both play each other in GW34 as is scheduled now.
Lots of the placement will depend on which teams in the other 3 matches advances and which teams are still playing in Europe (both UCL and Europa).
Newcastle and Crystal Palace have their DGW in GW32 and there's good odds that most DGWs from the FA Cup SF will go to DGW33, but GW36 is also a potential. GW34 is likely for the next blank between the FA Cup semi teams.
Bottom line, unless you really need to, don't make too many plans now before the QFs are played on 29 Mar to get the results of who blanks and doubles. The when of each can still be announced by EPL at a later date, so banking transfers, a WC, and a FH if you are able to will be useful things.
Here's some odds for the FA Cup SF participant potentials to impact GW34 blanks:
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