With the announcement of the ending of season 9, it is possible that 4.2 will go live at the end of the month. Although it is strange that they implement a new system for weapons... maybe its just something new they wanted to try out, or maybe it has something to do with 4.2.
My theory is that 4.2 will go live 3 weeks after the start of the new arena season, which is when it will be possible to attain enough conquest points to get a season 10 weapon.
What do you think?