The new runway name [that is the so called 5th runway] will be called 18-36. It should open for VFR traffic at the end of this year. By the end of 2003 it should be fully up and running with all systems [ILS] calibrated.
I personally don't see any additional runways coming, just maybe perhaps a 8000ft parallel Kaagbaan [06R-24L]. The thing is that within a couple of years, AMS will have a 2x2 operation, meaning that at anyone time two runways will be available for inbound traffic [18+19R, or 06+01R/27], and two other runways will be avialable [independently and simultaneously] for outbound traffic [24+19L/09 or 01L+36]. This results in airfield capacity of 120+ movements an hour, which is amongst the top in Europe. Only CDG has higher potential capacity. LHR can only dream of this number of movements. Maybe FRA will also approach 120 movements per hour when their fourth runway opens in 2007 or so.
At AMS, an additional north south runway in between 18/36 and 01L-19R does not make any sense at all from air traffic perspective. It will only make sense if the new north south runway and current 01L-19R will also be used from and to the south, since it will give AMS four parallel north south runways. However this will severly limit operations on 06-24. And 06-24 is the most preferable runway considering aircraft noise. So an additional north south runway will not happen.
An additional 06-24 would be of some use, but is unlikely since quite some recently constructed large office blocks will have to be demolished.
It would make much more sense to use 01R and/or 04 as the second inbound runway in combination with 24. But this should be accomplished in combination with the segragation of heavy and light traffic. Medium to heavy traffic should use 06-24, and light traffic [stage 4 compliant regional jets] could then use 01R-19L and 22-04. The approach path for 04 and outbound path for 22 could be flown parallel to 06/24 if new IFR approach procedures can make this possible.
The biggest problem for AMS is that with heavy east/west winds, operations are limited to 1x1 [single departure and single arrival runway: 09/27 + 06/24]. This is the biggest problem since these wind conditions prevail for over 40 days every year, causing severe delays when air traffic volume requires 2x2 operations. AMS desperately needs another east west runway [which will allow departures to and arrivals from the east], but there simply is not enough space available.
If new technology becomes available that can allow AMS to operate a indepently 2x2 operation, AMS does not need any new runways. Theoratical airfield capacity will then be something like 800,000+ movements a year. Off course this won't happen any time soon, since AMS is by noise abatement law limited to 600,000 movements. Adding additional runways won't help to raise this limit.
Immigration officer: "What's the purpose of your visit to the USA?" Spotter: "Shooting airliners with my Canon!"