From the website (changes underlined):
Division One is a six-team competition with clubs competing for the Kentwell, Burke, Barbour (U21 Colts), Whiddon, Judd and Sutherland Cups.
Teams (8): Blue Mountains, Colleagues, Drummoyne, Hunters Hill, Lindfield, Mosman, Newport (+1), Waverley
Division Two is a five-team competition with clubs competing for the Barraclough, Stockdale, Robertson (U21 Colts), Blunt & Richardson Cups.
Teams (6): Briars, Forest (-1), Petersham, St Patrick's, Sydney Irish (+1), UNSW
Division Three is a three-team competition with clubs competing for the Clark, Farrant and Nicholson (U21 Colts) Cups.
Teams (8): Beecroft (-1), Hawkesbury Valley, Hills (-1), Hornsby (+1), Knox, Lane Cove Old Ignatians, Old Barker, Western Raptors (+1)
Division Four is a two-team competition with clubs competing for the Jeffrey and Radford (U21 Colts) Cups.
Teams (7): Balmain (+1), Brothers [Colts] (+1), Chatswood, Macquarie Uni (+1), St Ives (+1) [Jeffrey Cup], Kings, Wakehurst
Division Five is a two-team competition with clubs competing for the McLean and Grose Cups.
Teams (6 - all dropped from higher divisions except Penrith): Canterbury (-1), Epping (-3), Penrith (new), Redfield (-1), Renegades (-1), Sydney Harlequins (-2)
Division Six is a one-team competition with clubs competing for the Meldrum Cup.
Teams (9 - all dropped from higher divisions): Blacktown (-1), Burraneer (-1), Colleagues Convicts (-1), Georges River (-1), Maccabi (-1), Manly Savers (-1), Merrylands (-3), North Cronulla (-1), Oatley (-1)
Not listed (at least, not yet): Sydney Harbour (were Div 3)
A big reshuffle at the lower end of the pyramid - don't personally understand why they shifted so many teams and cups around 4th-6th Div either but will be interesting to see how it plays out.
Big losers are the Rams, Quins and Merrylands - feel especially for Epping and Quins given their successes relatively recently
Will be interesting to see how Penrith fare, although coming into Div 5 is not exactly auspicious