They don't make a lot of First Aids. If Hasbro wants a white and red ambulance guy, Ratchet tends to have that covered, and if you're looking to make a First Aid out of some pre-existing ambulance guy toy, it's a hard sell to make a white and red ambulance guy into another white and red ambulance guy. You already have that toy as a white and red ambulance guy.
That's why, out of all the Protectobots, First Aid is among the least to be revisited. There are occasional Hot Spots because he's a blue fire truck and so that's a less redundant deco to go to on a red firetruck toy. There are new Blades redecoed out of helicopter toys constantly. Even Streetwise got a new toy at BotCon a few years ago, a Prowl in black and red to echo Streetwise's Generation 2 toy. Only Groove feels as left out as First Aid, and it's not a conflict of toys problem with him, it's just that nobody friggin' cares about Groove.
So bam, it's 2015, and here's your First Aid toy. He's sort of a retool of Offroad, the new Stunticon pickup truck, but in his case the word "retool" is pretty insufficient to describe what's going on. A fan term for toys like him is "reshell," since First Aid really only shares his connector peg, his thighs, and some internal jointing with Offroad. Most of the actual robot parts and the entirety of the vehicle is a new sculpt. He transforms entirely the same as Offroad -- they share engineering, that is -- but the sculpt is almost completely different. So that's actually pretty cool. It also results in some kinda uncanny deja vu as you transform him.
Despite this seemingly being First Aid's first victory over Ratchet in the toy aisle since like 1986, he's, uh, still gonna be retooled as Ratchet, apparently. His comic book has an "oops" where it shows the toy with a Ratchet head. It's probably why his chest looks like a van window bisected by his connector peg, rather than First Aid's segregated dual vent pecs. (And, likewise, Ironhide is gonna be the head retool from Offroad.) A Ratchet hasn't been solicited yet, so this is just a potential release and might just be a head that never gets used, but even when First Aid gets his day, his day is still partially Ratchet's. Poor First Aid.