Here are my guesses -
Preaching Work
There will be a move away from distributing literature to the public which will mirror the decline in printed media in the rest of the world. They will shift more toward special tract distributions, such as invitations to conventions, memorial, and the Sunday public meeting. The public Watchtower will cease to be printed.
Meetings
The Sunday meeting will be more public friendly. The WT study will move to the weekday meeting accompanying an abreviated TMS and Service meeting. The book study will be moved to the off-night "Family Worship Night" along with selected articles from Our Kingdom Ministry.
Organizational Numbers
There continue to be an increase in memorial "partakers" and the WT will discontinue publishing this figure as it is vestigial from the days where it was a gauge of determining the nearness of Armaggedon.
In Western lands there will a general decrease as the current generation of children fall out during their teen and young adult years. This sharp decline will be obscurred by a campaign to weed out faders. This decline will be spun as a harvest sifting.
Doctrine
Blood will be officially a conscience matter but still be severely discouraged.
1914 will be held onto but will not be focused on.
The Governing Body will number themselves at twelve in equation with the apostles and will assume the role of the Faithful and Discreet Slave. The concept of the anointed will be further dilluted if not done away with all together. In Jesus parable the GB will be the FDS, all Jehovah's Witnesses will be seen as the domestics, and the belongings will include WT buildings and real estate holdings. (The WT may get more involved in real estate to offset the decline of income from literature sales.) There may some changes on who is considered "anointed" and who partakes, this will serve the purpose of organizing and controlling as well as solidifying the unofficial caste system that already exists while consolidating power.
The WT will get more involved politically though stopping short of direct participation in the military.
Leadership
There will continue to be a shortage of elders and ministerial servants which may contribute to reverting back to a single "company servant" type role supported by a body of ministerial servants.