Here is another way of looking at it
406.3, covers General Installation Requirements, it states that receptacle outlets shall be located in branch circuits in accordance with Part III of Article 210, (note located). For general installation requirements this section uses the mandatory language ?shall be in accordance with 406.3(A) through (F)?.
Now the OP was talking about replacements, I go to sub-part (D) Replacements, (and it uses the term ?shall? also) Replacement of receptacles shall comply with 406.3(D)(1), (D)(2), and (D)(3) as applicable. This section gives specific language as to how to replace a 2- wire receptacle, a 3- wire receptacle and also when to use GFCI. . There is no mention in the 08 referencing 406.11.
Also Bob mentioned 406.8, I don?t see anything in 406.3 mentioning replacement of outdoor receptacles either. If you follow the above reasoning then there is a case to make to not use a WP on replacements.
Now don?t read anything into this typed message I do not wish to convey a tone. I simply enjoy the process of reasoning out a conflict of opinion regarding the language in the Code. Frankly it?s how I form opinions.
Thanks