It was called an AGSM last year too so I don't think its a clue to anything bigger in and of itself. Also the normal date of AGM's for POET(OPEL previously) has been in June. Last year's AGM(or AGSM if you prefer)in August was the anomoly.

And to answer your question about why call it an AGSM, maybe they are just becoming a little more precise in their use of the term in the last couple years.

This excerpt is taken from POET's own By-law No. 1 on their website. (Bold mine)

http://www.poet-technologies.com/wp-content/uploads/2013/07/ByLawNo1-Amended-Restated.pdf

"7.4 Notice of Meetings. Notice of the time and place of a meeting of shareholders shall be given not less than twenty-one days or more than fifty days before the meeting to each holder of shares carrying voting rights at the close of business on the record date for notice, to each director and to the auditor of the Corporation. Notice of a meeting of shareholders at which special business is to be transacted shall state or be accompanied by a statement of the nature of that business in sufficient detail to permit the shareholder to form a reasoned judgment thereon and shall include the text of any special resolution or by-law to be submitted to the meeting. All business transacted at a special meeting of shareholders and all business transacted at an annual meeting of shareholders, except consideration of the minutes of an earlier meeting, the financial statements and auditor’s report, election of directors and reappointment of the incumbent auditor, shall be deemed to be special business."

Green