For number 1 there is still the Front Office button in the team dropdown.
For number 2, it will only show trades which you make in the game, it won't show past trades the team may have made. So you'll need to sim forward a ways before you'll se anything there.
For number 3, development lab has been removed (because there is no coaching in Go), but there should be no button. Perhaps you are referring to the player development tab? That one is in fact new to Go25, and is meant to be there
If it still seems to be a bug though please post in the tech support forum with screenshots and we can take a look
Go has never been the same as desktop, it has always been a stripped down version. We didn't remove any features from Go - this year we added almost all of the new desktop features (except for the development lab) to Go. The new features are listed in the in-app description and include
Player Development Focus,
Player Ratings Changes (new ratings, and upgraded from a 1-250 scale to a 1-550 scale),
Player development & creation completely updated,
Perfect Team Card Combinator Screen,
Perfect Team Chemistry Screen,
Perfect Team Tournament Roster Builder Built In,
and more small things like the Manager Decision History, 3D Filters, etc.