To fit an 11 speed free hub which is longer the wheel has to be dished tighter on the drive side with a narrower axle , some newer wheelsets and mavic wheels are compatible with 11 speed cassettes and are normally marked 10/11 speed and come with a spacer to use 10 speed , older wheelsets are not compatible and you might need to replace the wheel .
If in doubt ask the LBS or a trek dealership
I think that the answer depends on whaht hubs you have. A quick google suggests that Bonty wheels with Formula hubs are upgradeable whereas Swiss DT hubs are not.
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