A chinese source on Weibo reports that:

Internal documents of Tamron have been exposed, and the market share of Tamron camera lens products accounts for about 19% of the global market share, ranking first among third-party manufacturers in the world. This is also the first document information about the market share of third-party brands.

Not sure how reliable this info is but this would be good news for Sony too as they own around 12% share of this company. Tamron will announce six new lenses this year, so expect some new exctiging glass!

Note: Via PetaPixel we got confirmation by Tamron managers that they are definitely open to the idea to design more prime lenses if they see a market request in that direction.