Assuming that it is Peace Talks split in two, that would make this a cash grab.
That's a possibility, but it's not necessarily the case. We all knew the peace talks would not end well. That was a given after the Christmas Eve story where Molly was consoling Harry in the aftermath of Peace Talks. However, the primary and secondary issues; whatever they may turn out to be, that Harry has to work through in Peace Talks may end up being resolved by the end of the novel. Battleground could be the natural extension of what happens after the talks fail, but with its own set of fresh issues for Harry to deal with.