The official internal communication (which you should be able to find on twitter or reddit) states cars ordered BEFORE April 17th should include the UMC (Mobile Charger). However - the wording is ambiguous - so you might need to fight / raise this on delivery if its not included.
Personally - and it pains me to say this, but this might be the last Tesla I order - until they can escape these short term quarterly cycles, I think this s**t is going to continue, removing features, finding ways to charge customers more (e.g. lease customers paying for PC). They're in a cycle where they can't not show a gain Q on Q - and we're the ones literally paying for it.
That said - the only benefit from it all right now - is that Tesla is continuing to deliver cars at pace.... so better than ordering from VAG right now!