I don't see the grinds being shorter, players would progress through the tiers too fast. Grinds will likely be much longer.
It sounds like some ships may not be included, which giving players less options seems like a bad idea. This could be alleviated with multiple lines per nation to address the missing ships. 3 BB lines instead of 2 for example. Also they could be put in as premiums, which again may agitate any players switching from PC having to pay for favorite ships that were tech tree.
Could really mess with CV placement in the tiers, given on PC you can't start them till Tier 4 iirc. That's even if they add them( yes I know they plan to). Dreadnoughts in the lower tiers could have a rough time against CV's.
Will add more thoughts later as I have time, screaming 2 month old to feed lol.