leecheeyee said:
The current type is old which producted from 1998. Now, I have one lens 70-200mm. But it is diffcult to snipe. I wish I can add from 200~400mm. Balance the cost and demand, 100~400 f/4-5.6 is so much suitable for me. Who do know it accurate day to deploy in market?
Rumors often do not actually happen. A new 100-400mm L has been discussed for many years. The cost of designing a new one that can outperform the existing one may be very high, so I'd just get the existing one and, if a new version shows up in the next few years, you can decide.
In order to keep the length short, Canon is using a rear focus design on the 70-300mm L, which will not accept a teleconverter. You might want to use one someday.