I would expect there would be some pressure mounting on both...

I would expect there would be some pressure mounting on both parties. I took from the original announcement that the transaction was expected to complete in October (not sure if an extension was granted).

I have heard that the acquirer may have engaged employment contracts with staff, had discussions with suppliers and was originally looking to rebrand ICS and open at least one site in NSW early December. I had also heard that communications from Aesthetica with staff has been scarce with most not having a clear picture of timelines.

I'll should clarify above by saying that I don't have direct contact with either of the parties involved but from the outside things do look to be progressing on some level.

I'm unsure why an announcement hasn't been made on the receipt of payment for the first tranche. $550k (plus security for the 2nd tranche) does not seem like a significant amount of funds to find for a serious suitor.