With the new changes that have just been announced...the mechanics of the game have been completely re-arranged.
The taxes are the most important change. Here is what it means...
Players will not be able to amass vast geographic empires.
Here's why (from the Game Guidelines):
Tax
There is only one certainty in MONOPOLY City Streets. Tax. Just like in real life, tax now plays an integral part of the game. Tax works as follows: The first 5 streets owned are not taxed. Thereafter, the current tax rate is 3% PER STREET you own.
For example, if you own 15 streets your tax will be 30% of your total rent collected every day. If you own 25 streets your tax will be 60%. Remember, at 38 streets you will effectively be taxed 100% and so won’t be making any profit and your bank balance won’t increase.
Source: Guidelines (also MCS blog post)
There is now absolutely no margin for owning any street that is worth under 1 Million or in the cities because those people will be far outstripped by players who buy the longest roads they can for 1 Million and put the most expensive buildings on it they can afford.
The tax is effectively a Socialist Cap on your income and a limit to your growth rate. No monopolies will be formed in this game as it currently operates.