will features be included in stable or not (I guess wishes will not) ?
Some features will be included in the first stable version, some will not. However, most if not all features will make it to a stable version someday.
In wishlist, there are issues we would like, not knowing if we'll ever be able to implement them, if they are feasible, etc. Some of the items in wishlist will make it to "features", fewer will directly be assigned to someone, but there are some which will not make it to Pluto.
Also, are there any functionalities that will enter into stable (I hardly imagine stable release without for instance photo albums viewing application ) ?
This is another issue. We don't (yet) have a list of features that will make it to the first stable version, but we're mostly bugfixing now. When we have a stable release, the whole project will receive more attention from the open-source community, so we'll be able to add more features faster.