I fiddled with the size of the images to get a sense of how big these could
be and my best guess is the package is roughly 4" x 6".
The figures are 3/4", not including the puck-like stand. (I wonder if there's significance to the uniform stand other than to save costs in tooling or production should it be a separate piece the figure is later attached to.)
At this scale, most of the ships would indeed be the same size as existing mm vehicles, the exception being the landspeeder. The one pictured appears slightly bigger (and obviously without a seated Luke). It also looks like the sandcrawler has less detail, but that could just be due to the low resolution.
Just caught this thread
over at RS. Someone's attributing to SSG that the micro line consists of rehashes from the diecast/x-ray ships.
The sandcrawler in the picture certainly resembles the diecast version more closely than than it does the mm vehicle.
That's going to be one huge peg hole!