"Environmental factors can trigger latent genes ... but the genetic information is already in the genome and is not acquired from the environment or because of the environment."
This is the creationist model of genomic change. It is quite Lamarckian -- the response was pre-coded into the genome, but it was itself a genomic (not just a phenotypic) change.
"I haven't seen anything new in this area since 1998 so it may be dead."
There's still work being done. See for example:
http://www.genetics.org/cgi/content/full/156/2/477
and also:
http://www.jbc.org/cgi/content/full/276/8/5700
The 2 examples I gave are not "pre-coded" (whatever that is), they are the result of viral infections entering a lysogenic (like) phase. There's nothing Lamarckian about this. So, are Creationists Lamarckists?