So as someone else said, what is the universe expanding into? It's expanding into the future, which is the major travelling direction of the time dimension.
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Then it will begin to contract, again. It's like a heart beat. & it will never stop expanding and contracting,because it is in side and out side of time all at the same time!
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"What is the expanding universe expanding into?"
Why, into the future, of course!
"With little doubt, the universe is expanding in all direction (seen via the Doppler Effect, etc., quantifiable, reliable and verifiable) and has been since the Big Bang."
The present is moving away from the past.
"What is it expanding into?"
The future.
"How can something expand into the "nothing" that would seem to be at the edge of the universe and, if the universe is a "bubble", what will happen should it reach the limits of its ability to expand?"
No bubble, the only edge is *now*.
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The Universe is expanding into Heaven..........................
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Seriously, that's like asking, if a house is orange, what is it orange into?
The universe doesn't need anything to expand "into". It just expands, all by itself. There is no "edge", there is no "outside". Things just grow more distance between themselves.