Does anyone know if this projector will have an adjustable focal length or will the placement of the projector determine the picture size? If it is a fixed lens will it be comparable to the standard LumenLab lens?
Thanks

What projector?

the placement of the projector determines 99% of the picture size. most people do design in the projection triplet to be adjustable, however, this is to fine tune the focus once the PJ is placed in the desiered location.

Neither the S15 'standard' lens, nor the pro lens are variable focus, therefore the projector distance determines the screen size. There is a varifocal lens which is sold for 'small panels' in the LL store, however it's intent is more to use the varifocal feature in order to focus the image, and not so much as a zoom lens.