We've added another line of toys to the Other Figures Database: The figures from the Russian brand Play Together (Играем вместе). Their line of figures contains the mane 6, but instead of Rarity they included Princess Celestia with red hooves (lucky Applejack didn't get replaced this time). The toys have been out for a while, but we've only recently heard about them. They can easily be mistaken by the Plush Apple figures, but there are some differences (e.g. hair and eyes).
Play Together sells a few variants of these figures, including versions with light or sound. They're packaged in sets of 2, either on cardboard or in nets (Princess Celestia seems to only be released in nets). Below we have some detailed images of the figures and their packaging.
Many thanks to Oleg for all the info and images!

A lot of people seem to don't know the brand called "Plush Apple" since a lot of the merchandise only makes it in Russia. But they seem to make some interesting and awesome merch! We wrote a special about their products here for those who want to know more.

The plushies we posted about a few hours ago aren't as mysterious as we thought. With the thanks of Tomo, we now know that the manufacturer of these plushies is called Plush Apple. And with the help of google translate, we managed to find a goldmine of merchandise produced by them.
While 'plush' is in their company name, they don't stick to just plushies, as you will find out shortly.
All of this merch has currently only been spotted in Russia. It's unsure if they are (or ever will be) available in other countries.

Russian toy wholesaler Begemott has listed 'Plush Apple' light-up plushies on their website. They are combined with a brush, and according to the listing, they will light up when you brush their hair. The complete mane 6 got a plushie. We have no further information on the producer (the listing says 'Hasbro GT') or any releases outside of Russia.
Thanks to Tomo for the info!
UPDATE: Manufacturer is called 'Plush Apple', we've compiled a post on all their current merchandise. We've also added a picture of how the plushies light up exactly.

Applejack's cheeks and cutie mark light up after brushing her hair (source).