We've got a lot of new capability pending, and should move to formalize a release. @wholmgren @mikofski @kevinsa5 @wfvining I am willing to manage v0.9 release. Here's the checklists. Please indicate what is needed to close a PR, or if you are willing to close any of the identified issues, or recommend deferring.

PRs to merge or defer:

• Fix to WVM methodology to track changes in MATLAB version. #1213 merged
• Add Array.get_cell_temperature, PVSystem.get_cell_temperature #1211
• Deprecate/raise error for PVSystem "pass-through" properties #1196
• Update irradiance.aoi to use more reliable formula #1191
• ENH: infinite sheds #717 @mikofski I'm guessing the infinite sheds PR will be deferred?

Issues to close or defer:

• change eta_m to module_efficiency #1188 will close with Rename eta_m and eta_m_ref to module_efficiency #1218
• irradiance.aoi can return NaN when module orientation is perfectly aligned with solar position #1185
• ModelChain.pvwatts_losses creates self.losses instead of ModelChainResult.losses #1184 PR mc.losses to mc.results.losses #1231
• It should be impossible to instantiate a PVSystem with no Arrays #1148 PR Raise ValueError if PVSystem constructed with 0 Arrays #1224
• Improve documentation of ModelChainResult class #1126 PR Docstring for ModelChainResult #1233
• Remove shadowed/unused kwargs from PVSystem methods #1118 PR removed kwargs in calcparams_desoto, calcparams_cec, and sapm #1222
• Update modelchain.rst #1115 PR Revise modelchain.rst for multiple arrays, results attribute #1223
• Remove default air temperature and wind speed from ModelChain.run_model etc. #1113
• make Array play nicely with fixed tilt systems and trackers #1109
• Applied PVsyst-type losses in ModelChain #1069
• move pvsystem.retrieve_sam to iotools #964 suggest deferring
• Inconsistent parameter name in fit_sdm_cec_sam()? #958 suggest deferring
• irradiance.detect_clearsky: possibly redundant input 'times' #954 deferred
• Improve docstring or behavior for irradiance.get_total_irradiance and irradiance.get_sky_diffuse #949 PR Better handling of missing inputs in get_total_irradiance, get_sky_diffuse #1225
• Consistent names for reference kwargs #825 recommend deferring
• Add a public constants module and include scipy as base requirement for pvlib #483 recommend deferring
• Breaking out parts of pvsystem.py? #436 maybe this can be closed, we've accomplished a substantial part of the scope
• ENH: allow user to specify the scaling of singlediode ivcurve-pnts or a specify an array, series, or sequence #418 recommend deferring
• define/improve documentation structure #329 perennial can to be kicked down the development road