The TRU page has now been updated with details of works for August...
On 6th/13th/20th of August, Huddersfield is closed to all trains, with TPE services between Liverpool/Manchester and Leeds/York diverted via the Calder Valley. York is also the eastern limit of services, with services to Scarboro', Saltburn and Newcastle also terminating at York.
Northern services on the Penistone line are truncated at Lockwood, with replacement buses linking Lockwood & Hudds.
Replacement buses are also connecting Huddersfield with Man Picc (fast and via all stations); with Leeds; with Manchester Airport (via Stockport); and with Brighouse & Halifax (to connect with Calder Valley services).
Huddersfield is closed to TPE (eastward only) on Sat 19th of August, with Penistone line services operating as normal.
All-stations Man Picc-Stalybridge-Huddersfield services will run with 1tph.
Liverpool-Newcastle & Manchester Airport-Saltburn services will still run, but diverted via the Calder Valley again. Scarboro' services remain truncated at York.
I'm also guessing Hull services will run to Leeds only on all 4 dates.