"WFIRST Ultra-Precise Astrometry II: Asteroseismology" by Andy Gould
"WFIRST Ultra-Precise Astrometry I: Kuiper Belt Objects" by Andy Gould
These papers are primarily about bulge survey science (KBOs and asteroseismology), but also discuss some issues that are likely to be of general interest (statistical limits to astrometric and parallax measurements, statistical limits to the precision of photometry and astrometry of saturated stars).
The following papers discuss HST results based on multi-epoch and/or multi-band HST imaging of bulge fields:
The following paper discusses the prospects for detecting transiting planets with a Euclid microlensing survey; the WFIRST-AFTA is obviously expected to substantially better.
"ExELS: an exoplanet legacy science proposal for the ESA Euclid mission - II. Hot exoplanets and sub-stellar systems"
Finally, here is a link to a webpage that discusses the JASMINE mission concepts: