Akuperma: A grand-coalition government between Labor and Likud would only exist if Netanyahu were prime minister. This is because if Netanyahu would not join such a government, then Labor would not be able to form a government at all.
In my opinion, either Netanyahu gets a right-leaning government including (among others) Bayit HaYehudi and the three charedi parties (Yachad, Shas and UTJ), or Netanyahu leads a centrist coalition including Yesh Atid and Labor-Livni. I don’t think the latter is very likely but some talking heads are saying there’s a 50/50 chance of a grand coalition.
You seem to be suggesting Bayit haYehudi would join a left government just to stick it to the charedim. I don’t think that’s possible, since their main issue is working against the two-state solution, which Labor is much more likely to implement. Kahlon would join the left under the right conditions, but not because he’s against charedim.
The only way Herzog could be PM is if they do better than expected in the polls, and Shas, Kahlon and Israel Beiteinu all somehow decide to join a Labor coalition.
Anyway, we’ll see what happens…