Regarding the rest of the update, official patch notes aren't available at this time, which means we don't know exactly what the "various fixes" entail. The update should be available now on PlayStation 5 and PlayStation 4.
Rolling out today, our new #MilesMoralesPS4 #MilesMoralesPS5 update adds the Advanced Tech Suit and includes various fixes. Additionally on PS5 only, the update adds realistic muscle deformation on select suits. pic.twitter.com/1nnSvgJB2P— Insomniac Games (@insomniacgames) March 30, 2021