  We present VLA and PdBI subarcsecond images (0.15"-0.6") of the
radiocontinuum emission at 7 mm and of the SO2 J=19_{2,18}-18_{3,15} and
J=27_{8,20}-28_{7,21} lines toward the Cepheus A HW2 region. The SO2 images
reveal the presence of a hot core internally heated by an intermediate mass
protostar, and a circumstellar rotating disk around the HW2 radio jet with size
600AUx100AU and mass of 1M_sun. Keplerian rotation for the disk velocity
gradient of 5 kms-1 requires a 9 M_sun central star, which cannot explain the
total luminosity observed in the region. This may indicate that the disk does
not rotate with a Keplerian law due to the extreme youth of this object. Our
high sensitivity radiocontinuum image at 7 mm shows in addition to the ionized
jet, an extended emission to the west (and marginally to the south) of the HW2
jet, filling the south-west cavity of the HW2 disk. From the morphology and
location of this free-free continuum emission at centimeter and millimeter
wavelengths (spectral index of 0.4-1.5), we propose that the disk is
photoevaporating due to the UV radiation from the central star. All this
indicates that the Cepheus A HW2 region harbors a cluster of massive stars.
Disk accretion seems to be the most plausible way to form massive stars in
moderate density/luminosity clusters.
