What will aliens look like?
They could in fact look remarkably similar to ourselves, according to the following logic:
They come from worlds similar to our own, and our bodies are an optimized design for an intelligent creature that lives on Earth
Standing upright, their limbs are free to manipulate tools for developing technology
A head on top is better for self defence and gathering food
Having eyes in their head allows a short nerve pathway to the brain. Those hoping for eyes on wavering stalks could be disappointed!
Their eyes would be relatively small like ours to avoid injury - stereotypical large eyes would be at more risk of injury in combat or hunting prey.