To be more specific, over a certain height in meters snipers are completely blocked. In one range X meters up to X meters the sniper must be limited in their movement and must always be exposed to ground units. In the last parameter, that sits at the lowest of meters snipers are given more freedom to move, and able to move in and out of exposure freely.

Just want to write down a few notes about what we changed in 1.4 in relation to joining a battle and explain some of the questions you might have. So in 1.4 alongside a new battle finder we have rewritten the matchmaking system, that is the logic that decides what battle you join and who you are playing with. There are a number of things that we are trying to optimize in this step, for example:

Matchmaking
We're aware of the issues surrounding queue times, half filled matches and preferences for match types. We're looking to improve both over the next two days and we're looking at 48-72 hours for the changes to go live on TQ.
Update 2013-09-04:Good news everyone! A fix has been staged for deployment today that should fix issues with partly filled battles, abnormally long queues, not matching into selected game types and improve network latency.
UPDATE: This fix was deployed 2013-09-04. More updates are coming for matchmaking later this week and next week, so please continue to give feedback.

...cont.