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By "expect" you mean "What will they be like in the near future," right? Otherwise your question can be answered by 20 minutes of reading online.
I think that in about 50+ years most small arms will be using caseless, self-propelled ammunition. Self-propelled ammo makes the most sense to me because it could be perfectly accurate (and actually change course slightly) until it runs out of fuel, and since most of the missile's velocity is gained after it leaves the barrel, it could reach speeds that would normally produce far too much recoil to be fired by a person. Ideally the tip will have an armor piercing shell with a high-explosive core.
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