Vasilis, any brand has its own strategy of working with collectors. These 2 previous years, both Mojo Fun and CollectA, are working closely with our forum. Mojo give us the opportunity of choosing a figure for their 2012 range that was the giant sable antelope. We voted here on forum and the brand made it and developed the figure according with a team composed of some members of STS.
Other figures were worked together with some STS teams, like the Iberian lynx, for example.
For 2013 range, the brand requested our wishes on their FB page and on STS and released several figures from our wishes. The sloth was developed in real time on STS forum, I think something never done before.
CollectA, a little after Mojo, through Numaan, started asking our wishes for some specific group of animals and is from there following many of our suggestions and also accepting our constructive criticism about the new released figures.
Safari was never close to STS, they have a strong FB community but I know they follow also some collectors comments, more in terms of manufacturing details then in species.
Some of us tried to contact Schleich and the brand replied often that their figures are targeted to kids not giving us many chances of discussing and suggesting.
Bullyland I really don't know.
Papo is a brand that lives in Mars, I am sure they follow our forum, through a Space probe, but it is only a question of Curiousity, I suspect. As one of my favorite brands, I tried to contact them via their website and also directly to their commercial manager but I haven't received a reply. Of course I don't like to insist, I don't even know they ever received one of these 2 messages. But they are very welcome.
Personally, it looks Maia & Borges will follow 3 personal suggestions of mine, I am trying to bring them to STS but they have to want it too. I suggested also a kakapo to Science & Nature some time ago but I doubt they are releasing it because of my suggestion. Contrarily to M&B, I haven't received any feedback from my suggestion so it is much probably a coincidence.
Joining the many STS projects more my few personal requests, I can't conclude that they don't follow us. I know there are here members in good position to bring Safari to our forum, I hope it will happen as well with many other brands.