.Any news on the developing of the core rules?
Sure! It turns out that the conversions of items and such are not super exciting material for an update but the process is done, along with lesser artifacts. We also finished up the feats system, including some that are only available to certain origins or certain classes. There are a fair bit and will really help customize the 5e character much the same way you can build a character in Symbaroum right now. This means that most everything that's expected to appear in a player's guide exists as words on the page, which is good news.
But we're aiming for a holistic approach, so we are also thinking and working on things like greater artifacts, troupe play, expeditions into Davokar and other GM-facing material right now. Parts of it are just good advice, so that translates very easily and then we just need to give you new mechanical handles to make things make sense in the 5e system. I'm really thrilled with the troupe system — it does regular a little bit of math but the multiple characters and multiple levels that it makes possible is worth it (and not to scare anyone on the math, its very much 'take one number, divide it by this number, that's your result. For each character of this level range take the result and multiple it by a number and that's the XP the character gets. And if you use an alternative levelling system, it's even easier ).