After 16 days “Waiting for review”, TypeIt4Me 5.3.1 – which fixes several bugs, including date/time expansion, Add a clipping and triggering abbs using TAB in Safari – is finally “In Review” and should therefore shortly become available in the Mac App Store.
Remember that if you are currently using TypeIt4Me 5.2.1 and do not need/want iCloud support, you can stay with 5.2.1 as 5.3.1 only adds iCloud support and no other features.