Anka have been used for air-to-ground aircrafts such as Anka, Anka 2 (Aksungur), Anka 3. So, Anka 4 will most likely be an air-to-ground aircraft.
The question is if Anka 4 is the 3rd or 4th aircraft depicted in the second row. In other words, will Anka 4 be a larger dual engine variant of Anka 3 or will Anka 4 be a swarm capable variant of Anka 3 working together with aircrafts in the first row depicting air-to-air fighters such as Kaan.
Note that the first and second rows have swarms as last step, this means that both rows will merge in the end to form a strategic unit with mixed air-crafts such as Kaan 2/3/4, Anka 4, and Kizilelma 2/3/4 as a swarm at some point in time.
We already know that work on swarm tech is ongoing so i think Anka 4 is the last item in row 2 in the picture. A small posibility is off course a two engine variant of Anka 3 for higher payload.
I think that TIA will use KAAN as a name for figthers and Anka for bombers considering that they are very good and easy names marketable different regions.