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In the "View Summoner Profile" in the Champions tab, each of the temporarily unlocked champions for the week has the mouseover message "Temporarily Available. Visit the store for more info." A new user would see the store icon above, click it, and be met with an information overload of the store front. In this information, nothing states why the champions are temps.
Using "Temporarily available for this week. Temp lineup changes on Wednesday." would give the users better info. If the client can link to the forum that post the new lineup, it would be even better. If the mouseover linking isn't possible, can that link be somewhere else within the tab?
tl;dr Mouseover message for temp champs is misleading.