There are basically two approaches to learn things:
You can choose either approach, but IMO you should stick to the one you chose.
It should also be clear whether the target audience are people new to GWT, or people who already used Maven to build GWT apps. For the first group of people, you need to put apart your own feelings about migrating from Mojo's plugin to mine; for the second group you'll likely want to explain how to convert their project, or at least what the differences are between their old approach and the "modern" one (your own term)
But well, this is your article, not mine; and (disclaimer) I haven't re-read it (just skimmed through).
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