Really? I wouldn't be surprised if they look more like us.
What drives you to that rather bizarre conclusion, since most exobiologists I have read would disagree completely ?
And they all fail to understand some significant things that are required to get anywhere:
1. A form that can build starships - physically (or rather the progenitor (no pun intended)) machines that do.
2. A form that is smart enough to so.
3. A form that can survive and evolve, and grow technologically long enough to so.
When you start taking all the exo-biologist projections, and evolution simulations, you see many fascinating things; all dumb animals.
Let's take them on one by one:
1. The need to use tools to build things, requires at least two free limbs/hands and opposable thumbs.
2. The reason that we're smart, is because we stand erect. The higher away from the ground, the cooler, less chance of a complex brain over heating. In a cold climate, as opposed to the hot we evolved in, we might get smart not standing erect, but we wouldn't get requirement number 1.
3. We are the single most efficient form on this planet. Granted, cockroaches may survive certain extreme climates and environments, on the other hand, I don't see any cockroaches on the north pole, or high up on freezing mountains. We are. We can spread anywhere - survive nearly anywhere short of extreme cases like radiation and chemicals - and thus are less prone to go extinct by environmental disaster. Similarly, our form allows rapid 360 degree turning, using weapons to increase our lethality against predators - etc. etc. etc. We are survival machines - and survival machines are those who will live long enough to reach the stars.
Indeed, the aliens we'll meet face to face, mind to mind, starship to starship, will almost all be quite similar to us. There'll be a few exceptions like ST's Sheliak who probably use telekinesis or something instead of hands, and a few may use tentacles, or trunks to manipulate tools and materials, but somehow I think they're a lot more rarer than hands.