I can not find a way to get these new extrafields system to work?
is there any tutorial that could show us how to create this what is described in the latest release?

2 new extra field types have been added" image & header. The "image" type uses the K2 media modal which you can use to select existing images or upload new ones by drag and drop. The "header" type is basically a "cosmetic" extra field. You can add "header" extra fields so you can group the field presented in the K2 item edit form (both in the backend and when frontend editing is enabled). This way, long forms with many extra fields are now easier to manage for content editors. There is also the option to display these "header" extra fields in the frontend, in case you also want to add meaningful headers to the extra field data you present on your site. So imagine for example a car database website that lists additional info for a car model: you can use the "header" extra field to add h4 html headers and therefore separate/mark/group info like "engine", "body", "tyres", "accessories" etc. It's a small addition, but it can be very helpful to have.

can we see this somewhere in action?
thank you

Create a new xtra field "header" type and look at it in the back end of the item. Change the order around to get it to serve as a title for a subgroup of extra fields

create an new img type extra field and place an image in it
edit in an override item.php and put just under where it displays title
<?php echo $this->item->extraFields->EXTRAFIELDALIASHERE->value ;?>
you should see the image beside the title

I dont see the possibility to create a subgroup of extra fields ?

ist not really a subgroup, just a header that you can seperate the fields with

but there is some code digging still required?
<?php echo $this->item->extraFields->EXTRAFIELDALIASHERE->value ;?>
???

you only have to add code if you want to display the extra fields in a different format or place than they normally appear

can get this done :sick:
cant find any area in the item php where it mentions img or header?

In the default item.php they are not included. You only need to change it and add code if you want it displayed somewhere other than the default extra fields are shown.
The header extra field types are only to segregate extra fields when you are adding a new item if you like.

Does anyone know how to add new extra fields to the Extra Fields? I want to add a date range picker.