Since it now appears that there's going to be an extended break before the first race (with no additional testing?), is anyone else thinking that the cars that we see at the first race may bear only a passing resemblance (internally/mechanically, anyway) to the cars that showed up for pre-season testing?

I haven't seen much written about this, but are ALL of the F1 teams (in addition to Ferrari and Alpha Tauri) on mandated lockdown, or are most of them still able to whittle away at new ideas and concepts?