no, it can get as high as you can get it, with item actives and team buffs.
Nope. I've had Master Yi go 510. In reality, there is no movement cap.
Go to youtube...
look Rammus 5k speed
u can hit like 2000 with yi 6 phantoms, revive and ghost lol
Clearly explains that MS isn't capped, but increasing it beyond a point would diminish the effectiveness.
Seen over 6000 on a Rammus with a bunch of speed helpers. Pretty insane, but the highest I've seen in real games has been 500ish range.
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