4th edition hidden rules and artillery recon

[larry marak]

If you want to set up units hidden in a town, the spotting range shrinks from 3 hexes for limiting terrain to adjacent spoting only. Once again a tremendous advantage for the defender or the attacker waiting in ambush.

Recon by artillery seems to be a compensating mechanism for the new hidden unit optional rules. Do you read this as ANY result of bombardment, including only a morale check which the defender passes, gives away the hidden location of the defender?

In general I like the enhanced value of artillery and recon units in 4th edition :-)