No point in putting Vehicle 1 and 2s and rules for tracks and wheels if they weren't going to release normal vehicles.
I believe from what I searched is that FFG wishes to promote the "Weird War II" theme before adding normal stuffs in. Tanks with legs is drawing the attention at them moment more than your jeeps, shermans and tigers. Not to mention flyers.
Who knows, the normal vehicles might end up upgraded with lasers/phasers in the end.