Wheeljacks. Can't live with 'em, can't melt 'em down. More to come.
Also, a little extra homecoming comic here: [link]
Part 1: [link]
Part 2: [link]
Part 3: [link]
Edit: A couple people have squee'd over Springer, so I thought I'd post a note on where to find him. He comes in the little Kreon blind packs. I got mine at Toys R Us, though you might be able to find him in the Valentine's section of Target. Here are the blind pack codes, so you know which pack he's in: [link]
Hope that helps!