So even though I can't claim to have anything other than theory to back this up, not a SINGLE wave 2 kit yet making it to Australia....
I think Wave 2 will have two levels of impact. At the lower level will be all the new ships, upgrades and combination available.
At the higher level of impact, I think there will now be enough diversity in potential fleet builds and tactical approaches, that a number of builds are likely to be "meta" at any one time.
Mucking around with fleet builder, sure its easy to build a 5 or 6 ship list, but I think this may be very vulnerable to Ackbar and his gunnery team assault frigates, as well as Worlds style fighter screens that can do a lot of damage as you try to close.
So what fleet configurations are going to be a feature?
I reckon Two ISDs with upgrades and fighter support (including rogues). - I think this will potentially be good, as each ISD can basically operate independently, in fact, with the expectation of Ackbar gunnery teams, would benefit from attacking from completely separate angles. They have the speed to do it, and the hitting power to rapidly destroy any small or medium ships as they go. I see this as a potential counter to the ackbar gunline. It also as room for multi firesprays or your other preferred fighter screen.
What other builds are likely to work?