A lot of people speculated that it would be Glenn, based mostly on what happened in the comic, yet Negan's other victim on the show met a very different end in the comics. Taking Abraham out first was a bit of bait and switch since most people who know the comic figured it would be Glenn (plus the fact that Glenn lived through the dumpster incident last season).
It's important to remember that just because something happened in the comic doesn't mean it will on the show, and Kirkman's been very vocal about that. Rick only has 3 appendages in the comics (which I thought was going to happen this last episode) but is currently whole on the show. Daryl doesn't exist at all in the comics, and a number of characters in the show are very different from what they are in the comic.
Having this particular plot point happen roughly the same way as the comic--as much as it sucks for those who liked that character--sets up a really, really brutal season ahead of us and makes The Governor look like Mr. Rogers compared to Negan.