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Last I heard (and I haven't had direct visibility into this since about 7 years ago) aliases are preserved between versions for backwards compatibility, but you shouldn't use abbreviated parameter names in scripts because there's no guarantee that they won't become ambiguous if more parameters are added to a command.

[jodrellblank]

That is true; but since the aliases and parameter names are discoverable with introspection, if you are writing a script you can have a tool which expands them all to their full name if you want that.

That said, the PowerShell team do care about breaking backwards compatibility, so this risk is more likely in a 3rd party module than in the PS main cmdlets.