It goes without saying that we will win the league. Even without Kane, we're the best team over a season in this league. Grealish will give us something different and I can see this lad becoming a Ballon D'or contender in a couple of years.
My gut feeling was that Chelsea will be our biggest rivals and I think part of this is that (a) they've got a good manager and (b) they've brought in a forward who knows where the net is.
However, the more I think about it, most teams won't have had much of a pre-season. This will be a problem for Tuchel as he's not been with the players as much as he'd like. Lukaku is going into a new team and they'll probably have to adapt to his way of playing. I think they will be capable of doing a job on the rest of the top 4 but overall I think this might be the season where he fine tunes the team. I've not much other than gut instinct but I think they will finish 2nd but not a threatening-90-point 2nd.
Liverpool will be hit and miss I suspect this season. Without doubt, once VVD is back and if Mane/Firmino/Salah are on form they will definitely give us a run. Again though I think the injury to VVD is going to take a while to get back to where he was. Robertson is out, Wijnaldum is gone and they've not really strengthened overall. I can see them threatening a lot, but not quite doing the business like they used to do. They'll be 3rd, but could be very capable if everyone stays fit of really pushing us for the title. Klopp is a superb manager.
I also think United are starting to build a good squad. Varane is a very good signing and Sancho will be another fast-counter-attacking player. Luckily, they are managed by an amateur who despite the players at his disposal can't take them past where they are. His counter-attack based game will take points from the top 6 teams and give them hope, but they will struggle against the busparkers - and this year I hope we park a massive bus at their place and play anti-football to show them what it's like. They will get 70+ points, maybe a final but nothing more than that.
If we get Kane, I honestly think we will break some of our own recent records. I can certainly see him breaking 40 goals a season and even the 100 pointer could go as well.