it would not change anything
why? Let's do it like you suggest and wait for permission to share.
Ok... got permission, I write the rumor
"Fujifilm will implement feature XY in the X-E3. But another source says there will be more new features"
Ok... there is still a vague rumor about "more new features" that I can not answer, because I have no clue what they are.
So I have 2 option:
1) share the rumor and say that, even though I have no clue what it is, a trusted source told me "more new features will come"
2) do like you suggest and do not tell anybody that the X-E3 will have new features, until (if) I can find out what they are
I prefer to share what I have... and in this case it's a vague hint (more new features).