Weisenburger delayed?

[Carvill John]

Here's what Amazon uk says:

Paperback: 416 pages
Publisher: University of Georgia Press (15 Nov 2006)
Language English
ISBN: 0820328073

The synopsis reads:

Adding some 20 percent to the original content, this is a completely updated 
edition of the indispensable guide to Thomas Pynchon's "Gravity's Rainbow". 
Steven Weisenburger takes the reader page by page, often line by line, 
through the welter of historical references, scientific data, cultural 
fragments, anthropological research, jokes, and puns around which Pynchon 
wove his story. Weisenburger fully annotates Pynchon's use of languages 
ranging from Russian and Hebrew to such subdialects of English as 1940s 
street talk, drug lingo, and military slang as well as the more obscure 
terminology of black magic, Rosicrucianism, and Pavlovian psychology. The 
Companion also reveals the underlying organization of "Gravity's Rainbow" - 
how the book's myriad references form patterns of meaning and structure that 
have eluded both admirers and critics of the novel. The Companion is keyed 
to the pages of the principal American editions of "Gravity's Rainbow": 
Viking/Penguin (1973), Bantam (1974), and the special, repaginated Penguin 
paperback (2000) honoring the novel as one of twenty "Great Books of the 
Twentieth Century."


And the hillarious first reader review (referring to the original, 
obviously):

Read GR many times before even thinking of looking at this, 12 April 2001
Reviewer: A reader

Gravity's Rainbow is a novel, a work of the imagination to be read and 
enjoyed. So read it and enjoy it. After you've done this several times you 
MIGHT want to take a look at this, to find out exactly what all the crazy 
references are to - but then, does it really matter? Do you really NEED to 
know which cartoon character he's refering to, or which film etc? No, of 
course you don't, unless you are the sad obsessive that GR unfortunately 
seems to attract. I've read GR several times, and it's probably my favourite 
book, and I don't care that I don't know the exact details of every last 
reference and frankly I think that only a real nutter would. So I give the 
Companion 5 stars for research but wouldn't bother reading it unless you are 
a GR twitcher.