It looks like a couple of researchers have designed a cheap and efficient means of communicating with cubesats. The smallest form factor for these, which is being used here, are only 10cm cubes, so they have no room for large antennae. Their design uses the PV panels as receivers, but this requires extra processing to pull the signal out of the noise, for which they are using a Pi compute module. Although it looks like it will be flown at some point, the paper does not give a planned date.
More details at https://arxiv.org/pdf/1709.03222.pdf.