There is no RuneScape 3 or 4. I deleted the original answer because it leads to a "hacker" site which puts a key logger on your computer, with the intent of stealing your RuneScape account. Only enter your RuneScape information on the Official RuneScape game website or on Jagex-created pages for your own safety. (Please see related links.)
No. That'd be a waste of time
The runescape you most likely play right now, the runescape that has HD and gets updated is RuneScape 2 and is already out and has been for quite a while. RuneScape 1 is the RuneScape classic mode, that only members can access.
Some day
In 2009-2010
It wont be, Runescape 2 will be the latest, they already have even better graphics, they only made runescape 2 in place of classic to make it look more better.
You can just use your wealth calculator in your equipment toolbar. BTW RUNESCAPE WILDY IS COMING BACK!!!!
Runescape 3 won't be coming out, there are fake sites for it though, but they are the same as Runescape 2 and they contain Key loggers and stuff, so be safe, stick with Runescape 2 and classic. Edit by English: RuneScape 3 (as said above) will not be coming out. JaGex has said this multiple times. However, a new game called MechScape has been mentioned recently, and it is supposed to be similar in an RPG style game, but JaGex clearly stated that it will take place more into the 'future' (rather than the RuneScape ages).
runescape
Yes, there will be a mummy 4 coming out
The very first Runescape was released on January 4, 2001. It's 8 years old.
The Halloween celebration or (Halloween Event) appears in the week of Halloween or October 31.
Yes, there is because Jagex wants it so more people can play.