In an interview at Fightnews.com, WBA middleweight titlist Felix Sturm says that Matthew Macklin has been offered a contract for a November rematch, but Macklin and team have not agreed or even really responded yet:

"We sent him a contract with much better conditions on the Tuesday after our first fight. But we still haven't received an answer and we're quite surprised that it takes them so long to react upon our offer. I mean, he was gunning for the rematch after the fight while still being inside the ring and I said yes. Him and his team strongly asked for a second bout at the post-fight presser and I gave them my word."

"...We gave them two deadlines to contact us and negotiate. They missed both of them and called one or two days later to extend the deadline, asking for more time to think about their future moves. I don't know why they need that much time. They asked and asked and asked for this fight. I can't tell you their problem."

Sturm (36-2-1, 15 KO) won a debated decision over Macklin (28-3, 19 KO) on June 25 in Germany. Some cried robbery because of Macklin's superior workrate (and the fight's location), and some like me felt it was a very close fight that could have gone either way thanks to the fact that Sturm landed harder, cleaner shots over much of the fight. Either way, it was a hell of a good fight and it seems everyone is on board with a rematch.

There are a few possibilities here:

1. As suggested in the interview, Macklin may feel a second fight is not to his advantage. I said after that I felt Macklin fought about the best fight he could have, while Sturm could definitely do better. This is half-trash talk, half-real possibility.
2. The offer might not be quite as good as Sturm believes it is, or at least wants us to believe it is. There's a very real chance that the "better conditions" for a rematch still aren't what Macklin would want, or feel he deserves.
3. Sturm is fibbing a little.
4. Macklin has other potential fights that are as lucrative or close to it.

You can take your best guesses, but this is the situation as stands until Macklin or his team respond.