I've read somewhere that in the patch for CK to put it in line with 1.5 patch there will be some new features,
but I wasn't able to understand which extra features were added...does anyone of you has any idea or a better source?

Thanks,
Jashkar

The 1.5.24.0 CK is synchronized with the 1.5.24.0 game, so it's record definitions are all current while older versions' are not.

Meaning you have to update your plugins by loading them and then saving.

There was actually at least one new feature added: there's a new checkbox on http://www.creationkit.com/Quest_Stages_Tab, "Keep Instance Data from Here On," but what it does is unknown.

Anyone found what it does yet?

If it's what I think it is, thank god.

What I think it is: "Keep Instance Data from here on" if the Instance data it's referring to is quest properties it could be that if you do not pass that stage, the quest properties will be reloaded from the plugin rather than from the save game. Although I kind of doubt this as it would be a pretty big change to how quests would work.

ever since 1.5.26 i'm getting many new glitch reports from users and all of them are related to enable parent markers. i don't know if this is something introduced by the new patch but now it seems that enable markers randomly switch on/off

I had an issue with my mod, it didn't kept the text replacements after a save/load and it displayed [...] instead.
It seems that using the new checkbox was the solution for it, but I can't give an exact definition on what it does.