I've just patched 2.4 over my last file, 2.3, and I'm on chapter 2-5.
I'm just now noticing that I have the four caravels from last chapter still in my army! Not sure if that's a pre-existing issue or something caused by the patch. JR is also still a mercenary even with 2.4 applied, I'm assuming I'd need to start a new game in order to have that actually overwritten.
The newest party member in 2-5 had me hollering, I was SO excited to recruit them.
Incredibly fun hack, I'm always looking forward to more updates!