Being a huge fan of classic Cluedo I was a bit sceptical of this revision, but I'm surprised to say the additions really do work very well.
There are three more murder weapons, increasing the number of solutions. The characters each have a special ability (e.g. take an extra turn once per game) which gives them a bit more individuality.
The biggest change is the addition of 'intrigue cards' which are drawn when landing on a '?' square, rolling '?' on one the dice or optionally when called to room as part of a rumour (suggestion). Intrigue cards also give you more options, but some are just 'clock cards'. The player drawing the last 'clock card' is killed by the murderer, adding to the tension late in the game. And the card goes back to the pile to be drawn again! I didn't like this mechanic at first, but I can see that it appeals to younger players and introduces a sense of urgency.
Also there are cosmetic changes: the board has been updated with modern rooms (e.g. patio, spa) and the characters have been given full names (though I can't help still using the old ones).
It still feels like Cluedo and is more fun. The only bad thing I can say about it is that the counters are a bit strange; upright slabs with a '?' on them. I much prefered the old counters that at least looked like they could be a person.
Overall a solid five stars.