Women's High Jump should be a great one. Already 10 women over 2.00m this year. Some may argue that it won't be competitive because Bergqvist is a 2.06m performer. However, her inconsistency should somewhat counterbalance that fact. She recently won the Swedish National Championships with a very modest 1.86m.
Not counting Aldama (because of the nationality issue), there are another 6 women over 14.75m this year. Of these 6 women, only Lebedeva has been over 15m, but the likes of Mbango, Martinez and Ndoye will put up a good fight.
Women's hammer should also be a great one, with a chance of the WR going. With Montebrun's recent injury, we don't know how she's going to perform, so the slightly less consistent Yipsi Moreno could be a favourite for the title. 16 women over 70m this year, and many women finding fitness at the right time should make for a great competition.
On the men's side, it goes without saying that the 100m will be an interesting final, purely because of the fact that it's so open this year. No-one is promising fast times, but it would be a relatively safe bet (even this year) to say that it will be won in a sub-10 performance.
The men's 200m is also quite open - at the start of the year KK was the favourite, but the times from his few races weren't amazingly fast. Needless to say, he is always a threat at major championships. The US guys will put up stiff opposition, as will Frankie Fredericks and Suetsugo.
5,000m will be a great one - Chebii, Gebrselassie, and Bekele are all gold medal prospects (Geb looking the slightly weaker one of the three, but history says that you can never count him out).