I see that people are as helpful as ever around here, well
@Tryndamere it all depends on why you dropped it in the first place, but to put it shortly Griffith got what he always wanted and got his own kingdom after defeating Ganishka(the head of the Kushan army if you reached that part) and Guts...well he just reached Elfhelm where he was hoping he could drop Caska off and get her healed. Does that answer your question?
And I just gave you the grand lines, of course there's a lot of stuff that happens in between but those are the most important bits, oh yeah and the merging of layers happened because of Griffith (and SK) so the Berserk world is a big fucked up place right now with all kinds of magical creatures going on a rampage.
It would be nice to know why you dropped it in the first place and if this kind of development could spark your interest again.