Somehow I had heard that RS3 will not have as bad of lag as we experience now with RS2. I will assume if this is true they will getting functional servers. Does anyone know if this rumor is true?
What do you mean when you say lag? Except for rare occasions, I don't experience any lag on RS2. If you play the HTML5 version of RS3 when it comes out, it probably will still be laggy if you lag on the current live game. Give it a little while though and it should be fine, assuming you've an alright computer.
I've never really experienced server lag with RS since they updated to EoC, only FPS lag. I'm guessing that because it's HTML 5 based there might be a bit of lag due to the GFX caused by FPS, but the chances of server lag are highly unlikely as they haven't been a huge issue with EoC.