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05AB1E, 13 bytes

ÅAIÅ»+;}θ‚ÂÆa

Outputs as a triplet [mean, progressive-mean, trend].

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Explanation:

ÅA # Calculate the arithmetic mean of the (implicit) input-list
I # Push the input-list again
 Å» # Left-reduce it by:
 + # Add the two values together
 ; # And halve it
 }θ # After the reduction, leave only the last value
‚ # Pair it with the earlier calculated arithmetic mean
 Â # Bifurcate this pair; short for Duplicate & Reverse copy
 Æ # Reduce it by subtraction
 a # And append this trend to the pair
 # (after which the result is output implicitly)