No. The new LG classes came out prior to the announcement of the $1,000 arena reward, they were expected, and have been a part of the current season for a while now.
We can, however, consider arena restricting (meaning no usefulness until next season if introduced mid-season) any future such changes, not just new LG items, including new skills.
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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z)
Probability
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