Now I know you've read the Jolla blog about this - but what it actually says is "ship a number of loan devices to selected developers by the end of June" (note the avoidance of the phrase 'in June')

The careful wording - and bitter experience - suggests to me that only a few devices will ship before end of June, and that they really do mean end of June (possibly beginning of July)

Also note the paragraph that states that the selected developers will have to sign up to a a Product Loan Agreement. Typically these include confidentiality/NDA clauses for pre-release software/hardware (which Jolla make very clear is what they are providing)

So, no, unlikely we'll see reviews of any kind by the end of June.