At present, I can't provide any definite news about Jonathan Franzen's new novel. However, in the world of literature, things can change quickly. His new work might be generating buzz in certain literary circles that we're not privy to yet. It's also possible that he's working in secrecy until he has a more polished product to present. Publishers are often very strategic about when they release information about upcoming novels, so we may just have to be patient and keep our ears open for any emerging news.
There may be news about his new novel out there, but I haven't come across it. Book publishers usually start promoting new works well in advance, so it might be a matter of time before we hear more. It could be that he's still in the writing or editing process, and once it's closer to completion, there will be announcements. Also, sometimes news about a new novel leaks from the literary community, so keeping an eye on literary blogs and forums might be helpful.
I'm not aware of any news regarding Jonathan Franzen's new novel at the moment. You could try searching on major book - related websites or following literary journalists on social media to stay updated.