Loreal Color Riche Caresse Wet Shine Stains have already launched in the US and I'm pretty sure they will be available in the UK at some point. I bought mine from this US ebay seller.
They are a cross between a lightweight gloss/stain and are said to be dupe of the YSL glossy stains - Loreal is the parent company to YSL. I haven't tried the YSL stains as yet so I honestly have no idea how they compare.
There are 12 shades of caresse shine stains available (in the US). I picked up rose on and on and pink rebellion. Both of these apply sheer to begin with but can be built up for more intensity. On my lips, rose on and on is a 'my lips but better' shade whilst pink rebellion is darker and leans more of a reddy pink. I didn't get on great with the loreal caresse lipsticks but I really like these. I get a glossy colour for about two hourss with these before they fade to a stain. They're really comfortable to wear, non sticky and feel hydrating. I like the doe foot applicator - I think it makes it easier to apply. I have a feeling these might be similar to the Rimmel Apocalips. I've only just got the apocalips so I will see how they compare. As a lot of people like the Caresse lipsticks, I will guess that the Caresse Wet Shine Stains will be a big hit. Look out for them hitting UK shores soon!