I haven't deepend too much into testing, but overall... yeah looks like same old same old. Would like to yawn! Predicting F1 has never been as easy as it is now.

Mercedes at the front.
Ferrari #2. Unclear, how much behind. It could vary. On some circuits close(ish), on some circuits far off.

Then it becomes more unclear.
I gather that Force India is pretty highly rated. But they are an underfunded team and if you look at history, they usually perform well only for half a year. Red Bull and Williams should be thereabouts as well.

McLaren-Honda, err... yeah, better not talk about them as per usual. Though they should be a bit better obviously, but that's a minor consolation.

Haas actually I have to admit has perhaps exceeded expectations. They are still going to be near the rear end of the field, but could be within striking distance of established teams. Guess the Ferrari help with all the gadgets and car parts has been enormous - otherwise it would be impossible for a new team to start out well.