Mobile players are PC players are in the same pool.
While PC players do have the apm advantage, the main part of winning TFT games comes from the decision making, not doing super high apm actions. This I know first hand as I've been playing with 500-1000 ms ping spikes, and can't do high apm actions. I still manage to get first place in many games.
Item scouting is possible on mobile. Just click the item icon (at top left part of the game) after you click on the portrait of your enemies.
Also, board actions will be locked during carousel rounds in set3. Meaning no sale of the board units to hit econ break points or to prevent units from combining.
Unless there is a major bug, mobile should come along with set3.